Used Darex Sp-2500 Drill Bit Sharpening Machine for sale (74,493)

Condition: good (used), Drill bit grinding machine Stock number: 3144 Manufacturer: DAREX Year of manufacture: 2001 Ibjdpfx Apsz Dandocjb Type: SP-2500 Model: 25G Machine number: 265148J Grinding wheels: mm Grinding range: 1.6 to 26.0 mm Diameter: mm Speed: 2,800 rpm Equipment: 200 mm collet chuck Collets: 3 to 16 mm Condition: good Connection: 230 V Total weight: kg Dimensions: 360 x 360 x 400 mm

Condition: ready for operation (used), DAREX AP 5000 / Precision spiral drill grinding machine -CE marking -Grinding range 1.5 - 26 mm -Suitable for standard spiral drills (HSS cobalt, optionally carbide) -Grinding types: conical taper, and automatic cross-grinding (split point) to reduce the transverse cutting edge -Automatic operation -Various inserts Isdpoy U H Ecefx Apcebb Dimensions: L x W x H 0.5 x 0.5 x 0.4 meters / Weight 50 kg Errors and omissions excepted.

Condition: used, Year of construction: 2019, - Magazine loading system - Clamping table for frame parts - 3 horizontal, longitudinal drilling units from the rear - 4 vertical drilling units from above 1 Drilling machine Manufacturer: KOCH Type: BL 2500 NC select line - used - Year of manufacture: 2019 Workpiece dimensions Workpiece length 150 - 2500 mm Workpiece width 20 - 300 mm Workpiece thickness 10 - 50 mm Material: Solid wood Magazine loading system 1 with workpiece return. Workpiece insertion via 2 parallel-controlled servomotors. The number of workpieces in the magazine depends on the workpiece weight. Manual workpiece insertion Clamping table for frame parts 1 By inserting 3 support segments into the longitudinal drilling units, workpieces can be inserted manually and clamped with clamping cylinders and templates. This also allows for special workpiece dimensions. Work cycle triggering via 2 manual controls on the swappable control panel. 3 horizontal, longitudinal drilling units from the rear Construction width 160 mm Drilling motor 2 kW Longitudinal adjustment (X) with LCD display Vertical adjustment (Z) With dust extraction 4 vertical drilling units from above (supported on one side in a linear guide) Adjustable over the entire working width (X), reading LCD display. Adjustable in working depth (Y), reading LCD display One vertical clamping cylinder mounted directly on the unit Counterpieces for through-holes are available as an option. Drilling motor 1.5 kW at 50 Hz Drilling stroke 50 mm Speed 2,800 rpm Total drill length 70 mm With 4 rotary indexing heads with quick adjustment (for vertical drilling units) with fixed stops at 0 and 90 degrees Positioning control KOCH NUMERIC Basic 1 Positioning control with Beckhoff C6920 industrial PC Intel Celeron 2.2GHz CPU 2.5 320GB HDD 1x RS232, 2x USB, 1x Ethernet available 15-inch touch panel Operating system Windows 7: English User interface in English Input of all machine commands via the touch panel Software is prepared for an online connection. The configuration of the online connection (network) and Iodpfx Apozuynhocsbb commissioning are carried out by the customer or their software company. USB port on the PC 4 x Dynamic NC axis (with bearing control) for Z axes Connection data 1 Electrical connection 400 V, 50 Hz, 3 phases Voltage fluctuations max. + 6 % to - 10 % If protected by an RCD (residual current device) on the customer's side, an all-current sensitive (R CCB, Type B) RCD with a rated residual current of /= 300 mA must be used. Air connection 7 bar Dust extraction air velocity min. 30 m/s Note: The technical data and descriptions are a transcript of the original order confirmation. The data is for informational purposes only and is not binding.

Condition: new, functionality: fully functional, Year of construction: 2026, CORMAK DG32MD is a professional spiral drill sharpener designed for intensive operation in industrial and workshop environments. The machine enables precise sharpening of HSS and cobalt drills in the diameter range of ø5–ø32 mm, making it a highly versatile tool for production plants, tool rooms, and service facilities. Thanks to the use of a powerful motor, CBN grinding wheels, and an additional drill web thinning socket, the DG32MD model ensures not only high accuracy but also complete regeneration capability for cutting tools. Main advantages of the machine Wide drill diameter range: from ø5 to ø32 mm – ideal for sharpening both small and large cutting tools. Adjustable point angle: 90°–135°, allowing sharpening of most types of twist drills. Two clamping systems (ER20 and ER40): provide secure and rigid drill mounting across the entire diameter range. CBN (borazon) grinding wheels included: designed for sharpening high-speed steel drills, offering high durability and precision. Ibjdpfx Apevu Ac Eocjb Stable and compact construction: with a weight of 32 kg, it ensures accuracy and vibration-free operation. Complete equipment set: includes collets, holders, and tools – ready for operation without the need for additional purchases. Design and technology The CORMAK DG32MD has been designed for intensive use and long service life. The machine features a robust housing resistant to vibrations and a 250 W motor with a speed of 4400 rpm, ensuring smooth operation even when sharpening larger diameter drills. The quick-change ER20 and ER40 holder system allows easy switching between different diameter ranges, while the precise tool guidance eliminates the risk of operator errors. Precision and work efficiency High-quality components ensure that the CORMAK DG32MD drill sharpener provides repeatable and precise sharpening results, even during continuous production work. Applications The CORMAK DG32MD model is suitable for: tool rooms and production plants where fast drill regeneration is required, repair workshops and maintenance departments, service centres, technical and training facilities requiring high sharpening accuracy and repeatability. Standard equipment 2 × CBN grinding wheels – for high-speed steel drills 12 × ER20 collets: ø5–ø14 mm 18 × ER40 collets: ø15–ø32 mm 1 × ER20 clamping holder 1 × ER40 clamping holder Technical specifications Parameter Value Drill diameter range ø5–32 mm Point angle 90°–135° Power 250 W / 230 V Motor speed 4400 rpm Weight approx. 32 kg Dimensions 400 × 260 × 300 mm

Condition: used, Shank cutters and drill bits in mint condition, unused, sharpened and second-hand, for CNC machines, as shown in the examples. Ibsdpfx Apjzrybpjceb Technical data: - Length: Various - Diameter: Various - Shank: Various - Weight: 12 kg - Application: Woodworking

Condition: used, Year of construction: 2026, functionality: fully functional, Sharpening device for drill bits made of HSS or any other hard metals, ensuring precise grinding and easy handling. Adjustable tip angle in the 90°–135° range. This model is equipped with an additional slot for sharpening undercuts. Machine features Precise grinding and convenient handling. Sharpening drill bits with ease. Portability due to its modest dimensions. Dressing wheel promising superb efficiency. Fully equipped; with a handle inside the device. Additional slot for sharpening undercuts. Technical data Drill bits diameters capability ø2–13 mm Angle of the tip 90°–135° Ibedpfx Ajzp Ea Eopceb POWER 120 W / 230V Motor speed 4800 rpm Approx. weight 9 kg Dimensions 330 x 170 x 160 mm PLEASE NOTE!!! This machine is a returned item; it is second-hand but in working order. NO WARRANTY AND NO RETURNS!!

Condition: new, functionality: fully functional, Year of construction: 2026, CORMAK DG20 is an advanced spiral drill sharpener designed for professional use in industrial plants, tool rooms, and service workshops. It enables precise sharpening of high-speed steel (HSS) and cobalt drill bits in the range of ø2–20 mm. Thanks to the CBN (borazon) grinding wheel, robust construction, and a complete set of collets, the machine ensures high-quality and repeatable sharpening results. Main advantages of the machine Wide diameter range – allows sharpening of drills from ø2 to ø20 mm. Adjustable point angle – from 90° to 135°, enabling precise adaptation of the cutting edge geometry to specific applications. CBN (borazon) grinding wheel – highly durable and designed for sharpening high-speed steel drills, ensuring excellent sharpening results. High rotational speed – the 4800 rpm motor provides fast and clean grinding performance. No need for specialized training – the guided tool positioning system allows accurate sharpening even without extensive machining experience. Compact design – small dimensions and a weight of 11 kg make it ideal for mobile applications and limited workspaces. Iedpfx Ajvu Abbopcjbb Complete equipment included – ER20 and ER25 collets with two clamping holders allow immediate operation without additional accessories. Design and technology The CORMAK DG20 drill sharpener is manufactured from high-quality components to ensure durability and precision. The rigid housing design minimizes vibrations, resulting in improved grinding accuracy. The key component is the CBN grinding wheel, designed for intensive use and ensuring uniform sharpening of every cutting edge. The collet guidance system has been optimized for ergonomics and repeatability, while the 180 W motor provides sufficient power for efficient regeneration of cutting tools. Precision and work efficiency Thanks to precise tool guidance and the appropriate grinding wheel selection, the CORMAK DG20 drill sharpener enables the user to achieve perfect cutting edge geometry. This results in: reduced cutting resistance, improved hole quality, extended drill service life. Operation does not require specialist knowledge – simply place the drill in the correct collet, insert it into the holder, and rotate it several times to obtain a fully functional cutting edge. Applications The DG20 model is suitable for: maintenance departments in industrial plants, tool rooms performing cutting tool regeneration and sharpening, service workshops and repair centers, technical schools and vocational training facilities for teaching basic tool sharpening skills. Standard equipment CBN grinding wheel – 1 pc. (for HSS steel) 11 × ER20 collets: ø3 – ø13 mm 6 × ER25 collets: ø14 – ø20 mm 2 × clamping holders – ER20 and ER25 Technical specifications Parameter Value Drill diameter range ø2 – 20 mm Point angle 90° – 135° Power supply 180 W / 230 V Motor speed 4800 rpm Weight approx. 11 kg Dimensions 390 × 175 × 170 mm

Condition: new, Year of construction: 2026, functionality: fully functional, CORMAK DG13MD is a high-quality spiral drill sharpener designed for professional sharpening of tools made from high-speed steel (HSS) and cobalt alloys. Its key advantage is the combination of precise sharpening performance with a compact design and exceptionally simple operation. Thanks to the use of a CBN grinding wheel and a complete set of ER collets, the machine enables fast and accurate drill sharpening without the need for specialized operator skills. It is an optimal solution for workshops, tool rooms, and industrial plants. Main advantages of the machine Sharpening of spiral drills from ø2 to ø13 mm with the ability to set the point angle from 90° to 135°. High-quality CBN (borazon) grinding wheel included – ideal for sharpening high-speed steel (HSS) drills. Additional port for split-point grinding – improves cutting efficiency and reduces cutting forces. Simple and intuitive operation – no need for prior operator training. Compact dimensions and low weight of 9 kg – easy mobility and convenient placement at the workstation. Complete set of collets and holders included – ready for operation immediately after setup. Consistent sharpening repeatability – essential for serial production and precision machining. Design and technology The CORMAK DG13MD is based on a robust and stable construction designed to reduce vibrations and ensure operator safety. The high-performance 120 W motor, operating at 4800 rpm, provides ideal working conditions even during continuous operation. The precise drill clamping system using ER collets and guided positioning in the clamping holder enables highly accurate sharpening, resulting in significantly extended tool life. The additional split-point grinding port allows correction of the drill geometry to reduce cutting resistance and improve drilling performance, especially when working with harder materials. Precision and work efficiency The CORMAK DG13MD drill sharpener has been designed to provide maximum accuracy in a short time. Thanks to the high-quality CBN grinding wheel, the machine produces a uniform cutting edge with optimal geometry, improving drilling performance, reducing cutting resistance, and minimizing the risk of drill breakage. The precise tool guidance eliminates errors caused by incorrect manual positioning, ensuring consistent sharpening results every time. Applications The DG13MD model is ideal for: tool rooms involved in the regeneration and preparation of cutting tools, maintenance departments in industrial plants, small and medium-sized production facilities where quick response and reduced operating costs are important, technical workshops and vocational schools. Standard equipment CBN grinding wheel – 1 pc. (for high-speed steel tools) 11 × ER20 collets: ø3 – ø13 mm 1 clamping holder with guide Technical specifications Parameter Value Drill diameter range ø2 – 13 mm Point angle 90° – 135° Iedpfx Apevu Ub Hjcjbb Power supply 120 W / 230 V Motor speed 4800 rpm Weight approx. 9 kg Dimensions 330 × 170 × 160 mm

Condition: new, functionality: fully functional, Year of construction: 2026, CORMAK DG13M is a compact and precise spiral drill sharpener designed for sharpening tools made of high-speed steel (HSS) and cobalt alloys. The machine combines high sharpening accuracy with simple operation, delivering professional results without the need for specialized operator skills. It is ideal for use in workshops, tool rooms, and maintenance departments. Main advantages of the machine Precise sharpening of spiral drills with diameters ranging from ø2 to ø13 mm. Adjustable point angle from 90° to 135° – compatible with most industrial standards. CBN (borazon) grinding wheel included – ensures accurate sharpening of HSS steel drills. Easy operation – the grinding process requires no previous operator training. Compact dimensions and low weight – a mobile device that is easy to move and install at any workstation. Complete ER20 collet set and holder included – ready for operation immediately after setup. Design and technology The CORMAK DG13M is equipped with a precise 120 W motor operating at 4800 rpm, providing optimal conditions for sharpening high-speed steel and cobalt drills. Thanks to the use of a CBN (borazon) grinding wheel, the sharpener ensures high durability and repeatability of the sharpening process. The solid cast iron housing eliminates vibrations, resulting in stable operation and uniform sharpening of cutting edges. Precision and work efficiency The CORMAK DG13M drill sharpener enables fast and repeatable sharpening of cutting tools, significantly extending their service life and reducing operating costs. The adjustable sharpening angle and dedicated collets ensure precise tool guidance, eliminating errors caused by manual positioning. Applications The machine is suitable for: mechanical workshops, tool rooms and production plants, maintenance departments, small and medium-sized enterprises requiring quick tool regeneration. Standard equipment Ijdpfovu Aakox Apcebb CBN grinding wheel – 1 pc. (for HSS steel) 11 × ER20 collets: ø3 – ø13 mm Clamping holder – 1 pc. Technical specifications Parameter Value Drill diameter range ø2 – 13 mm Point angle 90° – 135° Power supply 120 W / 230 V Motor speed 4800 rpm Weight approx. 9 kg Dimensions 330 × 170 × 160 mm

Condition: used, Engraving Cutter Grinding Machine MBB - Maschinenfabrik Baden Baden Type FSS Serial No. 2861 Year of manufacture: 1987 Grinding wheel diameter: 100 mm Grinding wheel speed: 4,600 rpm Motor power: 0.25 kW Power connection: 380 Volt, 50 Hz - Collet clamp device for collet 355E (saw thread M20x2 mm) Ibjdpfx Aoyxy S Rspcsb - Including 3 collets Ø 0.5 - 6.0 - 17.0 mm - Maximum collet bore: 18 mm - Grinding wheel dressing device - Cup wheel Ø 100 mm - Operating manual Space required (L x W x H): 450 x 450 x 300 mm Weight: 32 kg Very good condition

Condition: new, Drilling and Milling Machine OPTIMUM OPTImill MB 4 - Exhibition Machine - This offer is for an equipment package. The following items and options are already included in the price: - Drilling and milling machine OPTImill MB 4 Optimum - Machine base MSM 3 Optimum Isdpfx Aou R Tftepcjbb - Collet chuck set MK 4/ ER 32 - M16 Optimum - End mill set HSS IMUM - Precision machine vice FMS 100 Optimum - new exhibition machine -

Condition: used, Sharpening machine for circular saws/rip saws IDL000829 - manufacturer: IMW Iedjvlczvjpfx Apcebb

Condition: new, Year of construction: 2024, functionality: fully functional, This powerful machine to meet the requirements of larger woodworking companies, ensuring exceptional sharpening results. Equipped with an electronic tooth counter and an autonomous cooling system. The ZM150 offers precise sharpening while maintainingoptimal operating conditions. With two electric motors, including a 150mm CBNdisk for sharpening and a motor reduction group for precise blade movement,this sharpener delivers outstanding performance. Power supply voltage - 380-400V Frequency - 50Hz Iodpfxexiv Uge Apcsbb Power - 0.20kVa Capacity - 65 teeth per min Blade width - 20 to 100 mm Tooth pitch - 6 -25mm Sharpening disc - Profiled 150mm CBN disc Weight - 115kg

Condition: new, Year of construction: 2025, The ZM101 is a pioneering product in our lineup, designed to sharpen sawblades with widths of up to 100 mm at a remarkable rate of 65 teeth per minute. This efficiency enables it to simultaneously service 3-4 bandsaw/sawmill machines. Equipped with an abrasive ceramic disk, the ZM101 can expertly sharpen all teeth with profiles. Its robust construction allows it to perform reliably under the most demanding conditions, making it a favorite among our customers. Additionally, its straightforward design ensures ease of use and low maintenance costs, further enhancing its appeal. Technical characteristics: Maximum length of the blade: 6000 (8000) mm Minimum width of the blade: 20 mm Maximum width of the blade: 100 mm Maximum height of the tooth: 12 mm Front angle of the tooth: 0÷25° Tooth pitch: Profile N: 10, 12.5, 15, 20, 25 mm Profile WM: 22, 25 mm Working capacity: 65 teeth/min Iedpfx Apoxlfwpscobb Size of the abrasive disc: Cut-in sharpening, profile N: ø200 x 10 x ø32, ø200 x 13 x ø32 mm Profile sharpening, profile WM: ø200 x 8 x ø32, ø200 x 10 x ø32 mm Voltage: 380 V Power of the electric motors: 0.09 and 0.37 kW Size: Without band saw holder (L x W x H): 750 x 550 x 1100 mm With band saw holder (L x W x H): 2000 (3000) x 1000 x 1100 mm

Condition: new, Year of construction: 2025, The ZM101 is a pioneering product in our lineup, designed to sharpen sawblades with widths of up to 100 mm at a remarkable rate of 65 teeth per minute. This efficiency enables it to simultaneously service 3-4 bandsaw/sawmill machines. Equipped with an abrasive ceramic disk, the ZM101 can expertly sharpen all teeth with profiles. Its robust construction allows it to perform reliably under the most demanding conditions, making it a favorite among our customers. Additionally, its straightforward design ensures ease of use and low maintenance costs, further enhancing its appeal. Technical characteristics: Maximum length of the blade: 6000 (8000) mm Minimum width of the blade: 20 mm Maximum width of the blade: 100 mm Maximum height of the tooth: 12 mm Front angle of the tooth: 0÷25° Tooth pitch: Profile N: 10, 12.5, 15, 20, 25 mm Profile WM: 22, 25 mm Working capacity: 65 teeth/min Size of the abrasive disc: Cut-in sharpening, profile N: ø200 x 10 x ø32, ø200 x 13 x ø32 mm Isdpfxoxliguj Apcobb Profile sharpening, profile WM: ø200 x 8 x ø32, ø200 x 10 x ø32 mm Voltage: 380 V Power of the electric motors: 0.09 and 0.37 kW Size: Without band saw holder (L x W x H): 750 x 550 x 1100 mm With band saw holder (L x W x H): 2000 (3000) x 1000 x 1100 mm

Condition: new, Fully automated machines for the trapezoid roll forming, in various sizes. Please, contact us in order to receive further information as well as the technical documentation. Ibjdpfx Aeyr Nkbepceb

Condition: new, Fully automated machines for standing seam sheet metal profiling (CLICK), available in various sizes and designs. We offer several standing seam profiles. Delivery times and machine configurations are determined on a case-by-case basis for each order. Please contact us for additional information and technical documentation. Roll forming machine. Ibedpfx Aoy Rkuyjpcjb

Condition: ready for operation (used), Year of construction: 1998, functionality: fully functional, machine/vehicle number: 980223, overall weight: 1,100 kg, spindle speed (max.): 17,000 rpm, number of spindles: 8, spindle diameter: 16 mm, distance between spindles: 50 mm, No minimum price – guaranteed sale to the highest bidder! TECHNICAL DETAILS Ijdjzzbdwopfx Apcjbb Number of spindles: 8 pcs. Spindle diameter: 16 mm Max. spindle speed: 17,000 rpm Distance between spindles: 50 mm Table length: 245 mm Table width: 735 mm Number of workpiece clamps: 2 pcs. Workpiece support/guide: Table MACHINE DETAILS Voltage: 415 V Fuse rating: 16 A Power: 7.5 kW Dimensions & Weight Dimensions (L × W × H): 1,700 × 1,100 × 1,150 mm Shipping weight: 1,100 kg Number of shipping packages: 1 pc. EQUIPMENT Drills included CE marking

Condition: used, Year of construction: 1999, Machine number: 9114108 Weight (approx.): 150 kg Motor power: 0.71 / 1.26 kW Iedpfxjzd Hnts Apcebb Overhang – stand to drilling center: 600 mm Max. material height: 200 mm Table width: 1000 mm Number of drilling spindles: 4 Drill chuck: Screw-in thread Drilling depth limitation: Yes Drilling stroke: 70 mm Speeds: 1400 / 2800 rpm Workpiece clamp: Yes Drilling feed: Hand lever Working height or feed table height: 890 mm, with lighting Storage location: Nattheim

Condition: used, machine/vehicle number: 008629, Max. panel length: 1300 mm Iedpfoz A Tnzsx Apcobb No of injectors: 1 Positioning of Units by NC: yes

Condition: used, Colour: Green Empty weight: 6.000 kg - Documentation available: No - CE certificate present: No - Drive system: Conventional - Number of axes [pcs.]: 3 - Table length [mm]: 2200 - Table width [mm: 1500 - X-axis travel [mm]: 2500 - Y-axis travel [mm]: 1400 - Z-axis travel [mm]: 1000 - Spindle diameter [mm]: 100 - Options: Digital readout - Transport weight [kg]: 6000kg Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Iedpfx Apewfpbbecsbb Lukas van Rossum

Condition: good (used), Year of construction: 2004, bore capacity in steel (diameter) 28 mm throat 300 mm bore stroke 150 mm distance spindle /table 60-765 mm Ibodpfx Apewgi Evocsb distance spindle/base plate 1.200 mm taper MK 3 threading M20/M24 column diameter 115 mm table-size 510 X 425 mm spindle turning speed - stepless 60 - 1:400 U/min total power requirement 1,4 kW weight of the machine ca. 350 Kg. dimensions of the machine ca. 1,9 x 0,6 x 0,9 m - Digital spindle speed display - Foot switch - Thread cutting device - Left-right rotation - 2-speed motor

Condition: good (used), bore capacity in steel (diameter) 28 mm arm length 700 mm workpiece height max. 1300 mm tool taper MK3 feeds 0,1-0,3 mm/U spindle turning speed range 100-1.220 U/min total power requirement 1,4 kW weight of the machine ca. 1,3 t dimensions of the machine ca. LBH 1,8 x 0,8 x 2,3 m Incl. cube table Incl. drilling feed Ibedpezfqmcsfx Apcjb Mechanical clamping

Condition: used, Year of construction: 1987, total width: 800 mm, total length: 1,200 mm, total height: 2,600 mm, Colour: Green Empty weight: 700 kg - Year: 1987 - Documentation available: No - CE certificate present: No - Serial number: 14441 - Drive system: Conventional - Drive system: Gear drive - Power [kW]: 2.2 - Table length [mm]: 500 - Table width [mm]: 500 - Drilling depth [mm]: 250 - Drilling capacity [mm]: 32 - Reach [mm]: 320 - Tool holder: MK4 - Main spindle power [kW]: 1.5 - Min. spindle speed [rpm]: 85 - Max. spindle speed [rpm]: 1500 - Options: Drill unit feed - Transport dimensions: 1200mm x 800mm x 2600mm (l x w x h) Ibedpfezkq Auox Apcob - Transport weight [kg]: 700kg - Transport packages [pcs.]: 1 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, Year of construction: 1997, total width: 500 mm, total length: 700 mm, total height: 1,800 mm, Empty weight: 200 kg - Year: 1997 - Documentation available: No - CE certificate present: No - Power [kW]: 1.1 - Table length [mm]: 290 - Table width [mm]: 290 - Drilling depth [mm]: 80 - Drilling capacity [mm]: 20 - Reach [mm]: 225 - Min. spindle speed [rpm]: 210 - Max. spindle speed [rpm]: 2580 - Transport dimensions: 700mm x 500mm x 1800mm (l x w x h) - Transport weight [kg]: 200kg - Transport packages [pcs.]: 1 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Iodpfx Apezry Ntjcsbb Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum